Jesse waleath



(No Model.)

J. WALRATH.

STEAM BOILER.

No. 327,841. Patented 0 1885:

mitizes se s: lnventor M W -QMW 625 UNITED STATES PATENT OFFICE.

JEssE WALRATH, OF RAOINE, WISCONSIN, ASSIGNOR TO THE J. I. CASETHRESHING MACHINE COMPANY, OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 327,841, dated October6, 1885.

Application filed June 16, 1885.

To all whom it may concern:

Be it known that I, J EssE WALRATH,aOitizenof the United States,residing at Racine,in the county of Racine and State of Wisconsin,

have invented certain new and useful Improvements in Steam-Boilers; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which IO it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters or figures ofreference marked thereon, which form a part of this specification. I 5This invention relates to the type of steamboilers constructed with alarge direct flue which at one end contains the grate and issues at theother end into a combustion-chamber, and with a number of smallreturn-fines by which the products of combustion are returned to theother end of the boiler, where the un consumed portions enter thesmoke-box and finally escape through the uptake.

My improvement consists of a hollow coil arranged in thecombustion-chamber so as to extend from near the flue-sheet to near theexterior head of said chamber, and to encircle an area somewhat greaterthan that covered by the direct and return fiues in the flue-sheet.

This coil serves to effect an active circulation of the water in theboiler to protect the exterior shell of the combustion-chamber from theflame and heat, and also enables the boiler to make steam Very quicklyafter starting the fire.

It consists, also, of certain details of construction relating to thecoil and its adjuncts, which will be more especially pointed out inclaims at the close of this specification.

In order that my invention may be clearly understood, I have illustratedin the annexed drawings,and will proceed to describe,a practical formthereof.

Figure 1 represents a longitudinal section of my improved steam-boiler.Fig. 2 represents a transverse section thereof, taken in the planeindicated by broken line at x of Fig. 1. Fig. 3 represents a detachedportion of the boiler, showing the openings by which the 50 boilercommunicates with the mud-drum.

Serial No. 168,883.

(No model.)

The same letters of reference indicate identical parts in all thefigures.

The shell A, heads B and O, flue-sheets D and E, direct flue F, andreturn-fines G may be constructed and combined as shown in the drawings,differing in no essential particular from the well-known construction ofhorizontal boilers'of this type,a combustion-chamber,

H, being formed between the rear flue-sheet,

E, and rear head, 0, and a smoke-box, I, between the front flue-sheet,D, and front head,

B. The front end of flueFforms the furnace, being provided with a grate,L, and the front head, B, is provided with a suitable furnacedoor,which, since the boiler illustrated is 6 5 adapted for burning strawwhen desired, is provided with a straw-feeding chute, K, which may bepermanently attached or detachable, and may be provided with aself-closing flap,

if required. The combustion-chamberH con- 0 tains a hollow coil, M,which extends from near the rear flue-sheet to near the rear head,

as shown in Fig. 1. The upper portion of the coil is flat and extendshorizontally across the combustion-chamber in a plane a little above thehighest return-fines, while the remainder of the coil is curved, so asto lie close against the boiler-shell, all as clearly shown in Fig. 2.Thus the interior space of the hollow coil covers the whole areaoccupied by the direct and return flues in the rear flue'sheets,andaffords ample space for the flame and other products of combustion. Theupper end of the coil projects through the rear flue-sheet, E, at apoint at about the water-line, though it may issue either above or belowthe said waterline. The lower end of the coil projects through thebottom of the combustion-chamber, and is connected througha valve, m,and

a pipe, m, with the lower part of the water- 0 space of the boiler.

A blow-off cock, m is provided, so that on closing valvem the coil maybe blown off at any time, and while the boiler is in operation, and mayalso be emptied, when required, to prevent freezing. The coil providesincreased heating-surface in the combustion-chamber, so that thegeneration of steam at this point is greatly augmented. The circulationof water through the coil is not affected to any ex- [00 tent by suchchanges in the water-level as oc our on a traction-engine boiler whenthe traction-engine is ascending or descending grades, so that there isno danger of overheating the coil during such changes of the generalwaterleyel.

A mud-drum, R, is secured to the bottom of the boiler, which connectstherewith by holes 1 r. The drum is provided with the usual blow-offcock.

The grate shown was constructed with the view of adapting it moreespecially for the burning of straw, although other light fuels and woodcan be successfully burned upon it. This grate is fully described andclaimed in my application for a United States patent filed August 5,1885, Serial No. 173,621.

I claim as my invention JESSE WALRATH.

Witnesses:

M. GOULD, CHAS. H. MINER.

